September’s full Moon rose on September 6 and October’s full moon is set to rise on October 5. Since the start of the Fall season fell on Sept. 22 the October Full Moon will take the title.
It’s called the Harvest Moon because it is the Moon that provides the most light soon after sunset.
"For several evenings, the moonrise comes soon after sunset," says The Old Farmer's Almanac. "This results in an abundance of bright moonlight early in the evening, which was a traditional aide to farmers and crews harvesting their summer-grown crops. Hence, it's called the 'Harvest Moon!'"